import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from './components/Login.vue'
import Home from './components/Home.vue'
Vue.use(VueRouter)

const router = new VueRouter({
  routes: [{
    path: '/',
    redirect: '/login'
  }, {
    path: '/login',
    component: Login
  }, {
    path: '/home',
    component: Home
  }]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to   将要访问的路径
  // from 从哪个路径跳转而来
  // next 是一个函数，表示放行
  //  next() 放行  next('') 强制跳转
  if (to.path === '/login') return next()

  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

export default router
